Top 20 NuGet detour Packages

A general non-destructive patch library for .NET and Mono modules
Auto-generate hook helper .dlls, hook arbitrary methods via events: On.Namespace.Type.Method += YourHandlerHere;
Flexible and easily extensible runtime detouring library. Wrap, replace and manipulate (Mono.Cecil) methods at runtime.
A library for patching, replacing and decorating .NET and Mono methods during runtime powered by MonoMod.
A library to assist with detours using the .NET CLR in (un-)managed processes.
Hook VMTs of a native applications from .NET
dotnet hook lib
Managed Hook allows you to hook any methods with a handler that is called when the hooked method is called.